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Join Date: Mar 2004
Location: Tucson
Posts: 1,288
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Rebuild Cold Start Valve?

Anyone ever rebuild a cold start valve? EPS - 1979 930
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AMG V8 SL55 Mercedes, 993 C2, 86' Carrera 3.6 hot rod, Purple 1998 993 that didn't make the cut, 3 very old 930s, A/Fuel Dragster CH3NO2 (R.I.P.), Blown Alcohol TAD, AA/AA, 360 Maxim wingless, Cummins Turbo Diesel. Amateur Welder, Painter and sculptor sort of. -
Old 02-17-2008, 07:13 AM
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No, but why bother when you live in Tucson? LOL

My 930 had the wire off the thermotime switch (which controls the CSV) for at least 8,000 miles and can't.... quite.... reach... the.... pesky.... thing.... in the limited space between the intercooler hard pipe and the chain case.

Still started perfectly in temperatures down to and slightly below freezing. The CSV only runs for a maximum of 30 seconds in the startup cycle anyway, once the internal heater gets up to temp it's no longer in the picture, regardless of whether the motor is running or not.

It's connected now, and I see no difference at all, frankly.
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'77 S with '78 930 power and a few other things.
Old 02-17-2008, 10:11 AM
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The CSV gets it's power from the starter motor primary wire, then the 12 volts goes to the thermal time switch for further decisions...
It only gets electricity to it's solenoid valve and opens while the starter motor is energized and spinning, and the duration it is open while cranking the starter is decided by the thermal time switch's ambient temperature reading.
You would have to be cranking the starter motor for 30 seconds in extreme cold for it to possibly be open and spraying fuel for 30 seconds... and that would probably flood out the motor.
Old 02-19-2008, 10:10 AM
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